/Engine/Source/Editor/Sequencer/Public/SequencerChannelTraits.h
Add a key at the specified time (or update an existing key) with the channel's current value at that time
A handle to the added (or updated) key
namespace Sequencer { template<typename ChannelType, typename ValueType> [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) Sequencer::EvaluateAndAddKey ( ChannelType * InChannel, const [TMovieSceneChannelData](API\Runtime\MovieScene\Channels\TMovieSceneChannelData)< ValueType > & InChannelData, [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) InTime, [ISequencer](API\Editor\Sequencer\ISequencer) & InSequencer, ValueType InDefaultValue ) }